Science Daily: Global warming is causing major shifts in the range of small mammals in Yosemite National Park, one of the nation’s treasures that was set aside as a public trust 144 years ago, according to a new study by University of California, Berkeley, biologists. The study, published in the Oct. 10 issue of Science, compared small mammal populations in the park today versus 90 years ago and found that mammals like shrews, mice and ground squirrels have moved to higher elevations or reduced …